content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import java.util.concurrent.*;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
  
  /**
   * Block until the upstream terminates.
   */
  final class NonoBlockingAwaitSubscriber extends CountDownLatch implements Subscriber<Void> {
  
      Throwable error;
  
      Subscription upstream;
  
      volatile boolean cancelled;
  
      NonoBlockingAwaitSubscriber() {
          super(1);
      }
  
      @Override
      public void onSubscribe(Subscription s) {
          if (SubscriptionHelper.validate(this.upstream, s)) {
              this.upstream = s;
              if (cancelled) {
                  s.cancel();
              }
          }
      }
  
      void cancel() {
          cancelled = true;
          Subscription s = this.upstream;
          if (s != null) {
              s.cancel();
          }
      }
  
      @Override
      public void onNext(Void t) {
          // not received
      }
  
      @Override
      public void onError(Throwable t) {
          error = t;
          countDown();
      }
  
      @Override
      public void onComplete() {
          countDown();
      }
  
      Throwable blockingAwait() {
          if (getCount() != 0) {
              try {
                  await();
              } catch (InterruptedException ex) {
                  cancel();
                  return ex;
              }
          }
          return error;
      }
  
      Throwable blockingAwait(long timeout, TimeUnit unit) {
          if (getCount() != 0) {
              try {
                  if (!await(timeout, unit)) {
                      cancel();
                      return new TimeoutException();
                  }
              } catch (InterruptedException ex) {
                  cancel();
                  return ex;
              }
          }
          return error;
      }
  }
  